Linus Torvalds.... Tim Patterson.
Only about 2% of the current Linux kernel is written by Torvalds himself.
-wikipedia
Tim Paterson (born 1956 or 1957) is an American computer programmer, best known as the original author of the popular MS-DOS operating system.
QDOS was approximately 4,000 lines of 8086 assembly code
source:www.answers.com/topic/tim-paterson

Although tim patterson is an impressive programmer, you cannot compare 1 person creating 4,000 lines of code for MS-DOS to 1 person creating windows XP which is now well over 50 million lines of code... And I have heard that Windows Vista is estimated to exceed over a billion lines of code...

Lets see Tim Patterson or Linus Torvalds create that... .